Abstract: An electrical-cord lock has a plug container (1) that is sized and shaped to receive an electrical-cord plug (2) laterally. The plug container has first and second ends (3, 4) that are closed and a closure wall (5) that is operable and closeable with a wall positioner such as a tongue-and-grooved slideway (8, 9). The first end of the plug container has a cord bay (6) that is sized and shaped to receive an electrical cord (7) laterally and to prevent passage of the cord plug through the cord bay. The wall positioner positions the closure wall selectively to open and to close the cord bay and the plug container. A closure lock (12, 18) locks the closure wall in closed position at an entrance to the cord bay and at an entrance to the plug container, such that the cord plug can be locked into and unlocked from the plug container with the closure lock on the closure wall.